Nice older Ithaca Lewis model,
The Crass model ended in the 61,000-62,000 serial # range.
The S signifies the No 1 Special and the 12 signifies 12 gauge. I must say the Nitro Powder Steel in the rib legend is not common. That is a new one to me. The buttplate is not an original Ithaca butt plate, it reminds me of a butt plate you might see on a European shot gun or rifle.
I’m pretty certain you should be using 2 1/2” shells in your gun, RST Shot Shells produces excellent light recoil 2 1/2” ammo for older guns just like yours.
Stan
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